Fix A/B detection with qbootctl on non-AB device

qbootctl may be installed on generic targets that have some A/B devices and some non-A/B devices. On non-A/B devices it outputs something like this:

qcom-sm7150:~$ sudo qbootctl -a
Invalid slot numberActive slot: (null)

This needs to be handled accordingly instead of turning the slot suffix into (n.

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• 2193c204 - Fix A/B detection with qbootctl on non-AB device

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mentioned in commit Adrian/msm-firmware-loader@4ca9554e

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• 4ca9554e - Fix A/B detection with qbootctl on non-AB device

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merged